[MLIR][LaunchFuncToLLVM] Remove typed pointer support (#70840)

This commit removes the typed pointer support from the LaunchFunc's
lowering to LLVM dialect. Typed pointers have been deprecated for a
while now and it's planned to soon remove them from the LLVM dialect.

Related PSA:
https://discourse.llvm.org/t/psa-removal-of-typed-pointers-from-the-llvm-dialect/74502

Author: Dinistro

mlir/include/mlir/Conversion/Passes.td

@@ -472,12 +472,6 @@ def LowerHostCodeToLLVMPass : Pass<"lower-host-to-llvm", "ModuleOp"> {
     dialect, emitting C wrappers.
   }];
 
-  let options = [
-    Option<"useOpaquePointers", "use-opaque-pointers", "bool",
-                 /*default=*/"true", "Generate LLVM IR using opaque pointers "
-                 "instead of typed pointers">
-  ];
-
   let dependentDialects = ["LLVM::LLVMDialect"];
 }
 

mlir/lib/Conversion/SPIRVToLLVM/ConvertLaunchFuncToLLVMCalls.cpp

@@ -298,7 +298,6 @@ class LowerHostCodeToLLVM
 
     // Specify options to lower to LLVM and pull in the conversion patterns.
     LowerToLLVMOptions options(module.getContext());
-    options.useOpaquePointers = useOpaquePointers;
 
     auto *context = module.getContext();
     RewritePatternSet patterns(context);